Status of Polarimeter GEMs

Kondo Gnanvo

SBS Summer Collaboration Meeting

07/13/2017

Outline

▪ Status of the Production

▪ Activities in the GEM “Clean” room space

▪ Preparation for GMn Experiment

SBS Summer Coll. Meeting @ JLab

Overview of SBS GEM Trackers modules

▪ Front Tracker (FT): Track of the recoil protons

⇨ 1st tracker: 6 GEM layers, active area of 150 × 40 cm2

⇨ Layer: vertical stack of 3 GEM modules (50 × 40 cm2)

⇨ Production: 18 modules (+3 spares)

▪ Back Tracker (BT): Polarimetry of the recoil protons

⇨ 2nd & 3rd Trackers: 2 × 5 layers, active area of 200 × 60 cm2

⇨ Layer: vertical stack of 4 GEM modules (60 × 50 cm2)

⇨ Production: 40 modules (+ 8 spares)

Front Tracker layer

INFN

(Rome, Catania)

Stack of 3

GEM

mo

du

les (40

×5

0 cm

2)

Back Tracker layer

(UVa)Stack o

f 4 G

EM m

odule

s(6

0 ×

50

cm2)

Hadron arm in GEp(5)

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SBS Summer Coll. Meeting @ JLab

Production of GEM modules @ UVa

▪ 43 modules built and tested

⇨ 41 modules: 100% operational,

⇨ 2 modules: 97% OK (1 bad sector)

▪ 5 spare modules in the assembly queue

⇨ 2 almost completed, all expected by August 2017

▪ 9 modules already moved to JLab in test lab

⇨ 4 modules stored in GEM “clean” room, 5 modules on test beam stand

⇨ Next shipment of 8 modules week July 17th

▪ All 10 Al frames for Uva GEM layers in store in test lab

⇨ Frame prototype tested at UVa

⇨ One frame will be fully instrumented with 4 modules and MPD electronics

Back Tracker modules @ UVa

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Al Frame prototype with 4 UVa GEMs

X-Ray setup @ UVa

SBS Summer Coll. Meeting @ JLab

Test of GEM modules @ UVa

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Cosmic stand @ UVa

▪ Cosmic stand setup

⇨ Test that the HV sectors are all operational

⇨ Data with 4 modules fully instrumented MPD electronic

⇨ Tracking efficiency studies

▪ X-ray setup

⇨ Test the modules in high rate environment

⇨ Test DAQ in high rate and high background

⇨ Performance of x-ray background with Sr90 as source

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Preliminary tracking analysis

SBS Summer Coll. Meeting @ JLab

Polarimeter GEM modules in Beam Test in Hall A (Fall 2016)

Setup in Hall A @ JLab

▪ 5 modules separated by 10 cm each: similar to a

SBS tracker configuration.

▪ Triggered by a lead-glass matrix at center

▪ Goals: Identify good tracks in a high rate,

background, effectiveness of timing and charge

correlation cuts to suppress background

▪ Placed at 70o, occupancy is ~ 1%, similar to GMn

Preliminary background suppression analysis

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SBS Summer Coll. Meeting @ JLab

▪ “Clean” room space for SBS GEM modules

⇨ Space allocated in the test lab for the storage of the GEMs modules

⇨ Migration of UVa GEM modules is ongoing

⇨ ⇨ First 4 modules arrive earlier this month

⇨ next 8 modules next week

▪ Setup of a cosmic stand for GMn GEM trackers

⇨ Goal: Have all 4 FT GEM layers (INFN) on the cosmic stand

⇨ One polarimeter UVa GEM layer on a separate setup

⇨ Cosmic data expected by 08/01/2017

▪ Goal: Full characterisation of the GEM modules

⇨ Evaluate the dead area (disabled HV sector), study efficiency, define the working HV

⇨ gas flow for each module, Full readout performance DAQ

Preparation for “Clean” Room space for SBS GEM modules

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4 UVa modules on storage shelves

Preparation for cosmic stand setupStandalone setup for UVa GEM layer frame

Bigbite Spectrometer for the GMn experiment

SBS Summer Coll. Meeting @ JLab

Preparation for GMn Experiment

GMn GEM Tracker: 4 layers

▪ Front Tracker layer: (150 cm x 40 cm) : 3 INFN modules

▪ 2 chambers already delivered @ Jlab, 2 on their way

One additional Back Tracker layer behind the GRINCH detector:

▪ Back chamber layer (200 cm x 50 cm) : 4 UVa modules

Front Tracker crate

16 MPDs (v4.0)

1 SSP

1 Trigger Supervisor

1 VME CPU or Controller

2 slots for HV PS

Back Tracker crate

7 MPDs (v.40)

1 SSP

1 Trigger Supervisor

1 VME CPU or Controller

1 slots for HV PS (or not)

2 VME crates for all 4 + 1 GEM layers

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Preparation for GMn: GEM Gas System

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Preparation for GMn: GEM Gas System

SBS Summer Coll. Meeting @ JLab

Consideration on HDM cables arangment for BT layer

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Holding rails for short HDMi

cables, path panels to the

MPDI and low voltage

adapter board

Patch panels from

short to long HDMI

cables

▪ Cabling to the MPD electronics

⇨ 4 layers of BT layer read out with 4 MPD modules

⇨ Data and control signal through HDMI cables

▪ Two sets of HDMI cables:

⇨ Short cables (0.5 m to 3 m) from the back planes (GEM modules) to patch panel / connectors

⇨ Need to decide if we use same length for all cables or adapt length to minimize cross talk, noise etc …

⇨ Try out pros / cons of different length approach with the layer in “clean” room before final decision

⇨ Long cables (minimum 8 m) from the patch panel / connectors to the MPD in shielding box

⇨ Connection between long and short cables through patch panel and HDMI to HDMI connector

SBS Summer Coll. Meeting @ JLab07/13/2017 12

Preparation for GMn: HDMI cable arrangement for the BT GEM layer

Analog (data) signal ▪ Minimize number of patch panels / maximize the one to

one HDMI to HDMI connection

▪ Color coded arrangement:

▪ Magenta: direct HDMI to HDMI connection

▪ Red: 3-to-4 patch panels (analog signals)

▪ Blue: 4-to-2 patch panels (digital signals)

▪ Cyan: 12-slots backplanes

▪ Yellow and green: 5-slots backplanes

▪ Brown: BT GEM module

SBS Summer Coll. Meeting @ JLab07/13/2017 13

Preparation for GMn: HDMI cable arrangement for the BT GEM layer

Digital (control) signal ▪ Minimize number of patch panels / maximize the one to

one HDMI to HDMI connection

▪ Color coded arrangement:

▪ Magenta: direct HDMI to HDMI connection

▪ Red: 3-to-4 patch panels (analog signals)

▪ Blue: 4-to-2 patch panels (digital signals)

▪ Cyan: 12-slots backplanes

▪ Yellow and green: 5-slots backplanes

▪ Brown: BT GEM module

SBS Summer Coll. Meeting @ JLab

Production Status of Polarimeter GEM modules

⇨ 43 modules already built and fully tested

⇨ construction of the last 5 to be completed by august 2017

⇨ 9 modules already move to Jlab, remaining to be moved by set of 8 in the next few weeks

Preparation and commissioning of SBS GEMs for GMn expeiment

⇨ Acitivites in the clean room in full mode

⇨ Cosmic stand setup on going for the FT layers (4 INFN layers needed for GMn)

⇨ BT layer need for GMN in a standalone setup for test

⇨ Gas system need for the GMn GEMs has evaluated

⇨ GMn GEM electronic shielding box has been designed and scheme for optmal HDMI cabling is set

⇨ Cosmic test should be ready tp start in a few weeks

Summary

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SBS Summer Coll. Meeting @ JLab

Backup

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Triple-GEM detector

SBS Summer Coll. Meeting @ JLab

Why GEMs for Super Bigbite Spectrometer (SBS)?

2D readout strips board

GEM foil: 50 mm Kapton + few

mm copper on both sides with 70

mm holes, 140 mm pitch

Strong electrostatic field in

the GEM holes, ~ 70kV/cm

▪ SBS require high rate and good spatial resolution in trackers.

▪ Gas Electron Multiplier (GEM) detectors provide a cost effective solution for high

resolution tracking under high rates over large areas

⇨ Rate capabilities higher than many MHz/cm2, High position resolution ( < 75 μm)

⇨ Large areas (100s of m2) at modest cost, low thickness (~ 0.5% radiation length)

⇨ Used for many experiments around the world: COMPASS, Bonus, KLOE, TOTEM, STAR

FGT, ALICE TPC, pRad etc.

⇨ Future experiments with GEMs: CMS Muon Chambers upgrade, SoLID Trackers, Moller,

P2 @ Mainz, tracking at the EIC …

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